Goodwill And Intangible Assets (Schedule Of Goodwill Balances For Continuing Operations By Reportable Segment And For Other Operations And Headquarters) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill balances by segment for continuing operations
Balance at the beginning of the period	$ 2,096
Acquisitions	10
Purchase accounting adjustments	26
Impact of foreign exchange rates	(5)
Balance at the end of the period	2,127
Terminix [Member]
Goodwill balances by segment for continuing operations
Balance at the beginning of the period	1,946
Acquisitions	10
Purchase accounting adjustments	0
Impact of foreign exchange rates	(1)
Balance at the end of the period	1,956
European Pest Control And Other [Member]
Goodwill balances by segment for continuing operations
Balance at the beginning of the period	150	[1]
Acquisitions	0	[1]
Purchase accounting adjustments	26	[1]
Impact of foreign exchange rates	(4)	[1]
Balance at the end of the period	$ 171	[1]

[1] European Pest Control and Other includes goodwill related to pest control operations in Europe.